Cloud VPS ipv6 configuration

Hi,

I've bought Cloud VPS and it says that I have ipv6 for free.
How can I configure it? Because if I try to ping it or whatever it's not working.

Can someone help me to set it up?
OS: Centos 7

Edit: Cloud-init is wiping everything out from: /etc/sysconfig/network-scripts/ifcfg-eth0

Here the same can someone give me the solution.

lsmod | grep ipv6
nf_reject_ipv6 13717 1 ip6t_REJECT
nf_conntrack_ipv6 18935 7
nf_defrag_ipv6 35104 1 nf_conntrack_ipv6
nf_nat_ipv6 14131 1 ip6table_nat
nf_nat 26787 2 nf_nat_ipv4,nf_nat_ipv6
nf_conntrack 133053 6 nf_nat,nf_nat_ipv4,nf_nat_ipv6,xt_conntrack,nf_conntrack_ipv4,nf_conntrack_ipv6

1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether fa:16:3e:7c:59:75 brd ff:ff:ff:ff:ff:ff
inet 00000/32 brd 0000000 scope global noprefixroute dynamic eth0
valid_lft 85237sec preferred_lft 85237sec
inet6 0000/64 scope link
valid_lft forever preferred_lft forever